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We’re writing in Cologne, 1886. Much has happened. Cologne has been under Prussian rule since 5 April 1815, and Cologne Cathedral has been complete for 6 years. The medieval city wall has been torn down since 1881 to make room for the city’s expansion, as everything is becoming crammed together. This is very visible when looking at the city from above. What will Cologne look like 10 years from now? You’d need a time machine to know for certain…